themes-wordpress/blockbase/sass/base/_layout.scss

:root {
	--wpadmin-bar--height: 46px;
}

.wp-site-blocks {
	min-height: 100vh;
	display: flex;
	flex-direction: column;
}

.site-footer-container {
	margin-top: auto;
}

body.admin-bar {
	@include break-small() {
		--wpadmin-bar--height: 32px;
	}

	.wp-site-blocks {
		min-height: calc( 100vh - var(--wpadmin-bar--height) );
	}
}